public class I extends Tetromino {
    public I() {
        cells[0] = new Cell(0,4, Tetris.I);
        cells[1] = new Cell(0,3, Tetris.I);
        cells[2] = new Cell(0,5, Tetris.I);
        cells[3] = new Cell(0,6, Tetris.I);
        //共有两种旋转状态
        states =new State[2];
        //初始化两种状态的相对坐标
        states[0]=new State(0,0,0,-1,0,1,0,2);
        states[1]=new State(0,0,-1,0,1,0,2,0);
    }

    }

